Automatic releasing choker hook



* Sezpt. 27,

s. AsHDowN AUTOMATIC RELEASING cxoxa Hoor:`

Filed March 17. 1927 INVENToR,

BY r

A TTOBN EY.

ifi is purposely provided to remove -r the'strain.

Patented Sept. 27, 1927.

'\ SYDNEY Asipownfor v i'oironm, iBRIrIsH COLUMBIA, CANADA;

AUTOMATIC RELEAYSN ;CHOKER! 'IIQOK.

t Applicationiedriarch 17251927. :serial Nar/'6,0m

; My invention relates to 4irnprovenuents in said eable kinkingi. at the ends thereof. .aiitoniatiereleasing chokerv hooksQused in lfPreferablyf'the inner or`-front surface of logging, and the inaiii objeetfot my iinpiove` lment is to .provide a( choker. hookwvhiehA Will.

5 be releasedyby the usualfop'ei'ationshin oonneotion Withlanding a `log` inthe-yard and providing slack for untasteningiti yet-Which isvunlikely to be unfaste'ned by the slack." sometimes oecuiringduring hauling the log in' tothe yard. The latter happens undereii' eun'istances vvliiehare likely to provide little x slack in ithe tagand chokerlnes because ot Zthe great resilience' of the overhead line sys- -tennzwhile in l,the"-t'o'rini-r casepainple slack.l

plate lies in a' Central fplanevr longitudinally througheye am" as indicated by line "0f-g in bosses,11,`11project torWard'It-roin the lovver end ofplateff) 'v'vith space lfitherebetween." Bosses 11 are the-jaws of therhook "andfontheirupper Vsurfaces is seat v17 protherewith and .also integral With sleeve 10.

' l'roin the supportingeables and alsojallovvg',v

sullicient' slack `infthe .tag and eliokermlinesI to -inake the unastening-ot the choker easyff I .attain this'a'nd other vobjects of n'iy iini: provenient with the devicey illustrated in the accompanying, sheet of== drawingsy which.

-- form vapart offfthisspecification, 'and in vwhich Figure 1 isa frontelevationotiinyj- Choker hook with :one endo-i" fthe Chokerline :engaged tliereiv'ithand" with the choker lll) a. side elevation orf Fig'. V1. 3 isaxbotton'iv plan view ol' `iny 'ehokerhook With'ztheiY lliiie'e'xtended through the choker eyesleeve-l f but Withthe loop'fin thel line vtofenelose the .of reduced-thickness at.Y 16,v 1"oft`o provide 'fr greater space therebetween. Traiisverse yThe lotver'jcorners Kof .bosses 'lt "aref tur-ned 5 toreward @12h14. ,Y lSaid overhangi'ngfl'ugs 14rha'vejfspaoe al? betvveenitheir.:piokiinate edgevs.v The outerfedges ofv .the ribs 13 :are

rounded grooves .18, v18fare 4providedin the Y bottom edges fof-jaws r.17u topi'ovidejeasy .shapes for5 the Aolioker eable'toeon'l'forn'i to Wlienbearing/fthereonr a'ndMalso, tol engage log and also lthe endlof -the line` to'fengaga ywith the bul-lhookrbrolrenaway. Fig; 2 is choker -line extended throughffthe eyey sleeve `but lotherwise broken. away. Fig. t is a therein andretainthe eablefknob': more Lpositively-'on itsseat durin`g operation when a s inalll aiiiountof cable slaek only provided. Tof one .en d "ofehok-er yeabletoinline. 159 is .fastenedkiiob orfferrule 20. .Thevotherend horizontal sect-ion ot Fig.' 1 on the vline l-A. f

- bottoni? planv'iew 'of Fig. 5. My illustrations falso-uiicludef Figures .7 and 8 drawnon a'snialler scale and showing,

vrespectively, lplan fandeliwatioiii'. vie'ivs of? alog engaged by choker.lineiastened by one 'oft nay ChokerA hooks` in which lonefend "f'onlyfof the choker? line'is '-shoWn' torfflack "Similar Characters refer toE lsini'il'ar partsrelated partsof; my ('i'inprovein'ent The plate;

i f` W/Vith partieular"refereneetothe several-;

'ofisaid choker Cfable-rnayhave anieyeispliced thereinor a .similar knob ffasten'ed thereto depending on the Character of the bull hook toy which it isfintended tor C onneetion; lThis end of the Choker line isnot shown. .lnob

le preferably. cylindriealinshape with a ieonvexilovveri end alf/20,v Slot la-,bet-weenvja'xvs 1l"l is Wideenough toadniit eabfle 19' therein butto@ lnarrow for .knob *20' to.V pass there to permitknob -20 betweenithein and back plate 95E While `-ribs 1 3 lhavesullioient''epaee ",:betvveen tors'aidlmobi which .therefore is :treefto seat on top -otj aufs.y 11i` Where aconcavefseat17 isprovideda-or the Convex' end a2 of knob-.20. rreefessa is provided in the 'rontfsurt'acefotlplate 9 to allovl'pleiity fot room for-the @able knob?, v2O to-fenter, i-and leav-erenga'gernent With-fthe hook. Alem all Corners and, surfaces with which theiknob "eye' 'sleeve 10' tranjsvers'ally 'and ii'ite'gral:` f f'andxable inayyeo'ntaet during use are pret- `through an aiigle'of 90o, either of which movements will free the cable from slot l; To engage the cable with the hook the above stated movements of cable and knob are reversed. When `fastening a line to a log with this hook it is placed on the log A, as shown in Figs. 7 and 8, and the knobbed end of the cable is passed beneath the log and brought over the other side thereof when the knob is caused to entertlie` hook between ribs 13 at enlargement 16 while the cable passes into slot 15. To do this only siitiicient slack in Y the loop around the log is required t'o allow the knob to pass above bosses or ilugsv 12 which in practice is about one half an inch. @nce the knob is within the hook with this small amount of slack in the loop it isA seated on the aws 11 and may be left by the operative with the assurance tliatit is unlikely to become disengaged of itself till strain is put on the choker line when it will become `firmly engaged with the hook and so remain till loosening slack is provided in the cable loop around the log.

`the loop around log A` more than the re- However, if in adjusting quired amount of slack is provided in the loop, knob 20 is inserted beneath lugs 14 atl 20 and cable 19 placed in slot 15 and then the operative may safely leave the hook for the following operative tension on the choker line, which, when it comes, will surely cause knob 20 to pass 4from its position shown at 20 to its fulleline position at 2O Y in Figs. 1 and 2 where it is properly seated .for retaining the hold of the cable on the log. For those not familiar with sky-line logging in the Northwest attention is called to the size and consequent stiffness of the 1% inches in diameter. This relative rigidity of the line requires different shapes of `hook to attain a desired objective than if a smaller and more `flexible line were employed. The proper working of my hook depends on normal logging methods as nowV followed in the Northwest woods.

Figs. 7 and 8 have been referred to above as'illustrative of the conditions under which the choker cable is placed around a log and then engaged with the hook.l They do not fairly represent this situation as theyshow a logV being trailed with the choker cableV regularly engaged near one end. y

However, to those familiar with the use of these modern logging hooks, no especial choker cables employed which usually are illustration will be required that they may fully understand what is described.

0n reaching the yard the log is lowered to the ground Vas at A and slack enough is allowed in the hauling line and iii the tag and choker lines to cause the choker line to fall backwards to the position shown at 19. The slaekened condition of line 19 allows it to slip through sleeve 10 of the hook and become thus loosened Vin its loop around the log. This will ease the knob on the seat and usually allow it to pass into enlarged openingl 16 between ribs 13 and above lugs 12. l/Vlien said hauling lines were fully slackened, as describeth the backward throw of the hauling end of the choker line 16 and the tag and hauling lines, not shown.,` will7 in a. hook constructed as shown, cause the hook to turn overon the log as shown at 9 in Fig.

8, with back plate 9 uppermost. Tvll/heu in this position with knob 20 lying in enlarged opening 16 the `knob falls out of the hook on to the log and a subsequent pull on the choker line 19 will iind the hook disengaged and the choker line free `to follow the pull and be drawn clear of the log. a shaking of the lines may be needed to fully free the knob from the hook. This agitation may be done bythe rapid succession of hauling and slackening movements in the lines by the donkey drums or by an operativo near the log. In most instances my hook is automatically releasable in the manner described.

In those cases when it fails thus to release it can be unhooked in the usual manner.

The releasing of theknob under the conditions described is aided by the rounded outer corners off bosses 12, the flaring of ribs 13V at 16 and the greater freedom provided by y recess t9 in the bottom of the cavity boidered by flaring walls 16.

The features of my improved hook in the order of their relative importance are:

` Transverse grooves 18iii the bottom of jaws 11 and contiguous with space 15'` therebetween to retain the cable when the nose of the log being hauled thereby is elevated; overliaiiging bosses 14 to embrace the knob when the cable and knob are being engaged with the hook in the presence of an abun dance of cable slack; the backsetting of the longitudinal center line of the eyesleeve to the plane of the front surface ofthe back.

plate; and the enlargement of conning spaces and shaping of parts to make the dis- Sometimes lfd) llO

engagement of the cable and knob easy when y the hook falls over front downward on the log. In these features and their useful combination my invention resides.` y

Having thusdisclosed my improvement, what I claim as new therein and desire to secure by Letters Patent is,-

1. A choker hook consistingof jaws with a cable slot therebetween having a countersunk seat for a cable knob thereon, an eyef f'f with to receive a cable knob therebetween.

2. A choker hook consist-ing of jaws with a cable slot therebetween having laterally rounded cable grooves in the bottoms thereof and a countersunk cable-knob seat on the top thereof, an eyesleeve juxtaposed to said knob seat backset therefrom, ribs connecting said jaws with said eyesleeve integral therewith spaced apart for a cable knobtherebetween, and arched inwardly-inclined lugs t extending outwardly from said ribs integral with said eyesleeve to house said cable knob therebeneath.

3. A choker hook consisting of a backplate, an eyesleeve integral with one end of said backplate the longitudinal axis of which is in the plane of the front side of said backtween extended forwardly from the other end of said back plate having a countersunk cable-knob seat on the side thereof opposite said eyesleeve the axis of which is parallel with said front side of said back plate and disposed forwardly thereof, and ribs extended on said backplate between said jaws' and said eyesleeve integral therewith to receive said cable knob'between them.

5. A choker hook consisting of a backplate, an eyesleeve integral with one end of said backplate the longitudinal axis of which is in the plane of the front side of said backplate, two jaws with a cable slot therebetween extended forwardly from the other end of said backplate having a countersunk f cable-knob seat on the side thereof opposite said eyesleev-e the axis of which is parallel with saidfront side of said backplate and disposed forwardly thereof, ribs extended on 'said backplate disposed forwardly therefrom between said jaws and said eyesleeve toreceive a cable knob therebetween and lugs. extended outwardly and arched toward each other from said ribs integral therewith and with said eyesleeve to house said cable knob.

6. A choker hook consisting,` of a backplate, an eyesleeve integral with one end of said backplate the longitudinal axis of which is in the plane of the front side of said backplate, tw-o jaws with a cable slot therebetween extended forwardly from the other end of said backplate having acountersunk cable-knob seat on the side thereof opposite said eyesleeve the/axis of which is parallel with said front side of said back plate the outer ends of which have lateral rounded cable grooves therein and the front sides of which are rounded next to said cable slot and on the outer ends, ribs extended on the front side of said backplate between said jaws and saidjeyesleeve spaced for a cable knob between them with flaring opposite sides midway between saidy jaws and said eyesleeve said front side of said backplate recessed juxtaposed said Haring ribs, and lugs extended forwardly fr-om said ribs arching toward each other integral with said eyesleeve to house said cable knob.

7. A choker hook consisting of a back plate, an eye sleeve integral with one end of said back plate7 two jaws spaced apart to receive a cable therebetween with their junction integral with the other end of said back plate having a countersunk cable'knob seat on the inner sides thereof opposite said cable eye sleeve also having lateral grooves to receive said cable when bent in the outer sides of said jaws.

SYDNEY A SHDOWN. 

